If a President Vetoes a Bill, What Is the Congressional

If a president vetoes a bill, what is the congressional action necessary for override of the veto?

A) Both chambers must approve the override by a minimum two-thirds margin.
B) A majority vote of both chambers is required to override the veto.
C) A two-thirds vote of one chamber is sufficient to override the veto.
D) A majority vote of one chamber is sufficient to override the veto.
E) The President's veto cannot be overridden.